you remember when john kerry ran against george bush on the friday before the election, osama bin laden came out with a screen against america, and people were sticking with what they know on national security. >> thank you so much. good to talk to you. >>> to michigan now and the enduring mystery of jimmy hoffa's disappearance. they will search for remains. john yang is there. >> reporter: good morning. this is the latest stop on the twisted path searching for jimmy hoffa. investigators are in that shed, gathering a soil sample to see if the mystery of jimmy hoffa rests here. more than 37 years after jimmy hoffa vanished without a trace, the trail led to this suburban home. an informant claims he saw a body buried here around the time hoffa went missing. first told the author of "the hoffa wars." >> he is adamant that he is buried at this location. >> reporter: he directed him to the local police. >> we believe the witness did observe something and we felt credible enough to take the investigation to this point. >> reporter: using ground penetrating radar, authorities found signs of so